239561689 has 2 divisors, whose sum is σ = 239561690. Its totient is φ = 239561688.

The previous prime is 239561687. The next prime is 239561713. The reversal of 239561689 is 986165932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227255625 + 12306064 = 15075^2 + 3508^2 .

It is a cyclic number.

It is not a de Polignac number, because 239561689 - 2¹ = 239561687 is a prime.

Together with 239561687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (239561687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119780844 + 119780845.

It is an arithmetic number, because the mean of its divisors is an integer number (119780845).

Almost surely, 2^239561689 is an apocalyptic number.

It is an amenable number.

239561689 is a deficient number, since it is larger than the sum of its proper divisors (1).

239561689 is an equidigital number, since it uses as much as digits as its factorization.

239561689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 49.

The square root of 239561689 is about 15477.7804933395. The cubic root of 239561689 is about 621.0679555998.

The spelling of 239561689 in words is "two hundred thirty-nine million, five hundred sixty-one thousand, six hundred eighty-nine".